<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>变量</title>
	<script type="text/javascript">
		// 变量：存储数据的容器
		// 变量的命名规则
		// 变量前的var
		// 
		var name = "学并思" ;

		document.write(name);

		var num1 = 90;

		var num1 = 100;

		a = 90;

		A = 80;

		姓名 = "学并思";

		age = 18;

		d =234234892384;

		orderId = 345345345;

		order_id = 345345345;

		// num3 = num1+num2;

		name;

		name = "xuebingsi";

		// document.write(num3);



	</script>
</head>
<body>
	
</body>
</html>